Hey ho, welcome to the project.
In your TR showcase thread there has already been a response by Gnomey that addresses some of the issues I can see with your exterior showcase. You especially need to take care of this ground texture problem that you've got going on. Without the right ground textures in place, I can't really get a good idea of how everything works together in your landscape design.

Other than that, you need to use the soften tool a lot more often. Not sure if you're aware that that is actually a thing. It's a simple tick box in the landscape tools. You have quite a bit of jagged terrain all over these two cells, especially in places where it's evident that you manually raised a lot of terrain to form hills and such.